AST-SMMW-40 millimeter wave radar system is an efficient 24GHz radar solution with complete functions and low cost. It is able to detect objects driving in speed of 70m/s above 40m away and trace 32 objects at the same time.
The system is composed by an antenna board and a main board. The antenna board integrates radar transmit-receive sensor chip with CMOS feature and a special antenna design, being 24GHz mm – wave. The main board has a high performance ADC chip and FPGA chip. It is realized by a whole set of radar algorithm.
|1||Range (small obstacle - such as people) 40m||40m|
|Range (large obstacle - such as truck)||50m|
|2||Relative speed||70 m / s|
|3||Horizontal scanning angle||±40 °|
|4||Distance accuracy||Error±9 %|
|5||Speed accuracy||±0.2 m / s|
|6||Angle accuracy||±1 °|
|10||System power consumption||2W|
|13||Signal modulation method||FMCW|
|14||Output mode||Analog continuous output|
|16||Working environment temperature||-40℃～+85℃|
|17||Save the ambient temperature||-60℃～+125℃|
|Contrast item||AST-SMMW-100||Similar products|
|Chip||Using CMOS structure, Efficient||Non-CMOS|
|Low power consumption||2W||4W|
|High accuracy: Relative distance||±0.01m||±0.1m|
|High accuracy: Speed accuracy||±0.2m/s||±0.5m/s|
1. Compact package, Solid state technology; 2. Cost-effective, Detection distance;
3. Light weight, Small size, Low power consumption; 4. Leading performance and durability.
Test object: MMW radar transducer Model: AST-SMMW-40
Working frequency range: 24GHz Power: 2W
Working voltage: 12V Working current: 170mA
Test purpose:It is an internal test to further understand detailed parameters and function of the product and provide more visual data for customers.
1. MMW radar transducer 2. Fixed suction cup 3. 360°adjustable fulcrum bar
4. Laptop 5. On-board emergency power supply: output 12 V 6. Power line and transmission line
7. CAN protocol analyzer USBCAN-I
Testing software:The upper computer SRR-test the company developed independently
Content: Mainly reflecting parameter level angle and testing speed
Testing environment: Normal driving road, MMW radar vehicle, driving block vehicle and special road section
Road section: Yuanhua Road, Qixia District, Nanjing
Road condition: Normal
Block: Bus, sedan car and battery car
Figure 1 Road
|Driving in normal lane||Quantity of block||Speed (unit: m/s)||Maximum angle|
Content: Mainly test precision and error range
Testing environment: MMW radar measurement, delicate roadblock vehicle, mark distance line and proceeding with caution.
Road section: Underground Parking of Nanjing University Science Park, Yuanhua Road, Qixia District, Nanjing
Road conditions: Normal
Roadblock: 7-seat commercial vehicle
Single static roadblock-vehicle
|R The actual value 40||R Measured value||Error||A (Unit: degree)|
|R The actual value 30||R Measured value||Error||A (Unit: degree)|
|R The actual value 10||R Measured value||Error||A (Unit: degree)|
|R The actual value 5||R Measured value||Error||A (Unit: degree)|
|R The actual value 3||R Measured value||Error||A (Unit: degree)|
|R The actual value 1||R Measured value||Error||A (Unit: degree)|
Driving in normal conditions with few vehicles.
Change of relative distance between MMW radar and roadblock leads to positive and negative speed in calculation.
In the first test roadblock data, due to crossroad and waiting for the red light, it can see the whole process that vehicle in landscape orientation lane goes into MMW radar supervision and out of the supervision range.
In the third test roadblock data, “-0.05m/s” may consider that the relative speed is zero.
|Phenomenon||Error Δ shall be within positive and negative 9% and it is becoming larger as testing distance is closer.|
1. The closer the distance is, the larger absolute value of relative angle of approach between MMW radar transducer and roadblock;
2. When the distance to the roadblock is too close, the larger the reflector of the radar block appears, the more reflect wave beams, and the calculative angle and distance through different algorithms vary due to different reflected waves.